In the fourth episode of the fifth series, the entrepreneurs present the following ideas to the dragons: * Recycling products. * Easily carried spare shoes for nights out. * Film production of a vanity-published book. * Milk-fruit smoothies. *... (more) Teach yourself to be a DJ. * Car cleaning without water. * Car boot tidy for groceries. * Children's light switches. * Cushion that shades you while you sunbathe.